Grinding wheel



May 22, 1956 Filed Aug. 6, 1953 J. H. BREISCH GRINDING WHEEL 2Sheets-Sheet 1 INVENTOR. JOHN A fine/5c Ar roezveys J. H. BREISCHGRINDING WHEEL May 22, 1956 2 Sheets-Sheet 2 Filed Aug. 6, 1953 IN V ENTOR.

United States Patent Ofi ice 2,746,217 Patented r-May .1956

GRINDING WHEEL John H. Breisch, Lakewood, Ghio Application August 6,1953, SerialNo. 372,745

Claims. (Ci.'51206.'5)

The present invention relates to grinding wheels and, more particularly,to a disk-type, artificial abrasive grinding wheel comprising hub-likemembers for attaching it to the spindle of a grinding machine.

The principal object of the invention is the provision of a novel andimproved, disk-type grinding wheel, the diameter of which can bemaintained constant or substantially constant throughout its life.

Another object of the invention is the provision of a novel andimproved, disk-type grinding wheel formed of a plurality of segment-likeabrasive members arranged in a circle to provide a substantiallycontinuous, peripheral cutting or working edge and so connected .to acarrier member attachable to the spindle of a grinding machine that theycan be moved or adjusted radially to vary the diameter of the wheel.

The invention resides in certain constructions and combinations andarrangements of parts and further objects and advantages thereof will beapparent to those skilled in the art to which the invention relates fromthe following description of the preferred embodiment described withreference to the accompanying drawings, in which Fig. l is a perspectiveview of a grinding wheel embodying the present invention, with portionsbroken away to show the construction;

Fig. 2 is a rear, side elevational view of the grinding wheel shown inFig. 1; and

Fig. 3 is a sectional view approximately on the line 3--3 of Fig. 2.

For purposes of illustration, the invention is herein shown anddescribed as embodied in a disk-type grinding wheel comprising 4 similarsegment-like units, designated generally by the reference character A,arranged to form an abrasive disk or wheel about'12 in diameter andabout /2" thick. The segment-like units A are .connected to a support orcarrier, designated generally by the reference character B, in such amanner that they can be moved or adjusted radially of the axis of thewheel to vary the diameter thereof.

One of the important advantages of the present construction is the factthat the diameter of the wheel can be maintained constant orsubstantially constant during the life of the wheel by adjusting thesegment-like units outwardly after the wheel has been reduced indiameter by wear and re-dressing the wheel to its original diameter, Theinvention, however, is not limited to maintaining the wheel at aconstant diameter and contemplates adjusting the wheel so as to be ofdifferent diameters, if desired.

Reference to the drawings will show that each of the segment-like unitsA comprises an abrasive segment 9 having its inner end secured to a basemember or holder 10, which member is, in turn, movably connected to thecarrier B. As shown, the inner ends of the abrasive segment 9 extendinto peripheral grooves 11 in the carrier members 10, which members arethemselves segmentallike in shape and are made of some suitablematerial, preferably a ferrous metal. The inner ends of the abrasivesegment 3 may be secured within the grooves 11 in 2 any suitable manneras by being cemented therein ror fastened thereto, as is the case in theembodiment shown, by studs 12 projecting from one side of the grooves 1.to the other and extending through the abrasive segments. The preferredconstruction shown permits badly worn or broken abrasive segments 9 tobe readily replaced.

The rear side of each of the segmental-like base members 10, as viewedin Fig. 1, is provided with a radial groove or slot 13 within which fitsa key 14 carried by a face plate 15 having a hub 16 formed integraltherewith, which hub is bored and tapped as at 17 for attachment to thespindle of a grinding machine. The construction just referred toprevents relative rotation between the segments A and the face plate 15while permitting movement or adjustment of the segments radiallythereof. In the embodiment shown the keys 14 are secured to the faceplate 15 by dowel pins 18.

The segment-like units A, as shown, are moved or adjusted radially withrespect to the face plate 15 and its hub 16 and held in anypredetermined position to which they may be moved by pins 20 fixed inthe base members 10 for the segments 9 and each comprising a tooth-likeprojection 21 interfitting in a spiral groove 22 formed in the near sideof a scroll disk 23 supported for rotation about the hub 16 and locatedadjacent to the side of the base members 10 opposite the side thereofengaged by the face plate 15. As shown, the pins 20 .are fixedly securedin suitable apertures in the base members 1.0 by a drive fit and eachpin includes a collar 24 fitting into .a counterbore in the base memberfor facilitating their attachment to the base member with their ends 21projecting therefrom a predetermined distance.

The scroll member 23 may be rotated upon the hub 16 in any suitablemanner. In the embodiment shown it-iis provided with two pins .25located apart and .fixed thereto by having reduced ends driven or forcedinto apertures drilled in the back of the scroll plate; tha't'is, theface thereof opposite to the face provided with the spiral groove 22.The pins 25 are located adjacent to the periphery of the scroll plate 23so as not to int rfere with a locking disk 26 hereinafter referred to.The-pins 25 provide hand grasp means for manually rotating the scrollplate 23 to move or position the segment-like units A radially withrespect to the carrier B. The segmentlike, units A may be locked in anydesired position by the locking disk 26, previously referred to, whichdisk is threaded onto the end of the hub 16 projecting through thescroll plate 23. The locking disk 26 is provided with notches 27 in itsperiphery for reception of a spanner wrench for rotating the same. Thespiral groove 22 shown is .of the single lead type, thus providing, afine adjustment of the abrasive segments radially of the wheel. It is tobe understood, however, that a multiple, lead type spiral groove may beemployed if a more rapid or coarser adjustment is desired.

In order to prevent the entrance of dirt, etc. into the groove 22 of thescroll plate 23, a seal is provided therebetween and the base members 10in the form of an annular, rubber-like belt or ring 23 having one edgeclamped to the periphery of the scroll plate by a guard retainer 30 andthe other edge engaging the base members 10.

While the preferred embodiment shown contemplates that the grindingmachine to which the wheel illustrated is attached will be stoppedduring adjustment of the wheel from one diameter to another, it will beapparent that the Wheel can be so constructed that it may be adjustedduring operation of the machine.

From the foregoing description of the preferred embodiment of theinvention, it will be apparent that the objects heretofore enumeratedand others have been accomplished and that there has been provided anovel and improved grinding wheel, the diameter of which can be variedor maintained constant, as desired. While the preferred embodiment ofthe invention has been described with considerable detail, the inventionis not limited to the particular construction shown and it is theintention to cover hereby all adaptations, modifications and usesrigidly connected to one of said plates and extending freely through anopening in the center of the other of said plates so that said platesmay be rotated with relation to each other, at least one adjustablesegment having at least a portion thereof closely received between saidplates, co-

operable means on said scroll plate and said portion of said adjustablesegment for causing said adjustable segment to be displacedsubstantially radially from the center of said scroll plate uponrelative rotation of said scroll plate about its center, clamping meanssecured to said supporting means so as to engage the outer surface ofsaid other plate and clamp said adjustable segment between said plates,and said clamping means being manually releasable so that said scrollplate may be rotated to change its relative position with respect tosaid adjustable element.

2. An adjustable mechanism comprising a backing plate oppositely spacedfrom a scroll plate, supporting means rigidly connected to one of saidplates and extending freely through an opening in the center of theother of said plates so that said plates may be rotated with relation toeach other, at least one adjustable segment having at least a portionthereof closely received between said plates, cooperable means on saidscroll plate and said adjustable segment for causing said adjustablesegment to be displaced substantially radially from the center of saidscroll plate upon relative rotation of said scroll plate about itscenter, clamping means secured to said supporting means so as to engagethe outer surface of said other plate and clamp said adjustable segmentbetween said plates, and said clamping means being manually releasableso that said scroll plate may be rotated to change its relative positionwith respect to said adjustable segment.

3. An adjustable mechanism comprising a backing plate oppositely spacedfrom a scroll plate, supporting means rigidly connected to one of saidplates and extending freely through an opening in the center of theother of said plates so that said plates may be rotated with relationtoeach other, a plurality of adjustable segments spaced about saidsupporting means and each having at least a portion thereof closelyreceived between said plates, each of said adjustable means having meansengageable with means on the inner surface of said scroll plate forcausing each of said adjustable segments to be displaced substantiallyradially the same amount from the center of said scroll plate uponrelative rotation of said scroll plate about its center,clamping. meanssecured to said supporting means so as to engage the outer surface ofsaid other plate and clamp said adjustable segments between said plates,and said clamping means being manually releasable so that said scrollplate may be rotated to change its relative position with respect tosaid adjustable segments.

4. An adjustable mechanism comprising a backing plate oppositely spacedfrom a scroll plate, supporting means rigidly connected to one of saidplates and extending freely through an opening in the center of theother of said plates so that said plates may be rotated with relation toeach other, a plurality of adjustable segments spaced about saidsupporting means and each having at least a portion thereof closelyreceived between said plates, each of said adjustable means having a pinmember extending outwardly therefrom toward the inner surface of saidscroll plate, said scroll plate having a spiral groove on its innersurface of a size and form so as to receive each of said pins thereinfor causing each of said adjustable segments to be displacedsubstantially radially the same amount from the center of said scrollplate upon relative rotation of said scroll plate about its center,clamping means secured to said supporting means so as to engage theouter surface of said other plate and clamp said adjustable segmentsbetween said plates, and said clamping means being manually releasableso that said scroll plate may be rotated to change its relative positionwith respect to said adjustable segments.

5. An adjustable mechanism comprising abacking plate oppositely spacedfrom a scroll plate, supporting means rigidly connected to one of saidplates and extending freely through an opening in the other of saidplates to form an axis so that said plates may be rotated with relationto each other about said axis, at least one adjustable segment having atleast a portion thereof closely received between said plates, cooperablemeans of said scroll plate and said adjustable segment for causing saidadjustable segment to be displaced substantially radially from said axisupon relative rotation of said scroll plate, clamping means secured tosaid supporting means to clamp said adjustable segment between saidplates, and said clamping means being releasable so that said scrollplate may be rotated to change its relative position with respect tosaid adjustable element.

References Cited in the file of this patent UNITED STATES PATENTS985,116 Nichols Feb. 21, 1911 1,511,165 Jaeger Oct. 7, 1924 1,582,608Hyde Apr. 27, 1926 1,652,885 Allyn 'Dec. 13, 1927 1,697,505 Hyde Jan. 1,1929 2,264,589 Rydquist Dec. 2, 1941

